Analysis

  • max time kernel
    58s
  • max time network
    60s
  • platform
    windows10-ltsc 2021_x64
  • resource
    win10ltsc2021-20241211-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20241211-enlocale:en-usos:windows10-ltsc 2021-x64system
  • submitted
    03-01-2025 15:45

Errors

Reason
Machine shutdown

General

  • Target

    Runtime Broker.exe

  • Size

    41KB

  • MD5

    3d8c8bdb3f9f8e2176e28bef2c32a872

  • SHA1

    c94ee52f063a8bcb37878a4a35f01e649a82d452

  • SHA256

    56abf6e0538aa01c4d703d318d6ab9d9f1d82a56e8327fa051af57c209270721

  • SHA512

    8ade0497a2f0d203c564fd90f7a370dc5c4c4bc6b2ec32d33da3d57897f4409b2857883aa3bb6c21276960035d07079422aaaf72987b9cce0e10efad77759138

  • SSDEEP

    768:zgBqG/D6Ykg+h5NMhllLW4pF5PM9lErl6TOwhp3tQj8:S3/D6A+hnErTFy9Wx6TOwPc8

Malware Config

Extracted

Family

xworm

Version

5.0

Mutex

89uVkC69u7sBIP4Y

Attributes
  • Install_directory

    %Temp%

  • install_file

    update.exe

  • pastebin_url

    https://pastebin.com/raw/EPNvLhJF

  • telegram

    https://api.telegram.org/bot7343382434:AAHVbjA3UMvHkIXFmk_EqanDZDs1lJukPtw/sendMessage?chat_id=1867331552

aes.plain

Extracted

Family

gurcu

C2

https://api.telegram.org/bot7343382434:AAHVbjA3UMvHkIXFmk_EqanDZDs1lJukPtw/sendMessage?chat_id=1867331552

Signatures

  • Detect Xworm Payload 2 IoCs
  • Gurcu family
  • Gurcu, WhiteSnake

    Gurcu aka WhiteSnake is a malware stealer written in C#.

  • Xworm

    Xworm is a remote access trojan written in C#.

  • Xworm family
  • Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

    Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Checks SCSI registry key(s) 3 TTPs 3 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Delays execution with timeout.exe 1 IoCs
  • Modifies data under HKEY_USERS 15 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: EnumeratesProcesses 61 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 60 IoCs
  • Suspicious use of SendNotifyMessage 60 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 16 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe
    "C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe"
    1⤵
    • Checks computer location settings
    • Adds Run key to start application
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:1136
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1976
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Runtime Broker.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:3780
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\update.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:5080
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'update.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      PID:400
    • C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "update" /tr "C:\Users\Admin\AppData\Local\Temp\update.exe"
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:2444
    • C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /delete /f /tn "update"
      2⤵
        PID:3120
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp4987.tmp.bat""
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:2288
        • C:\Windows\system32\timeout.exe
          timeout 3
          3⤵
          • Delays execution with timeout.exe
          PID:4324
    • C:\Windows\system32\taskmgr.exe
      "C:\Windows\system32\taskmgr.exe" /7
      1⤵
      • Checks SCSI registry key(s)
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      PID:2236
    • C:\Users\Admin\AppData\Local\Temp\update.exe
      "C:\Users\Admin\AppData\Local\Temp\update.exe"
      1⤵
      • Executes dropped EXE
      PID:3604
    • C:\Windows\system32\LogonUI.exe
      "LogonUI.exe" /flags:0x4 /state0:0xa39d7055 /state1:0x41c64e6d
      1⤵
      • Modifies data under HKEY_USERS
      • Suspicious use of SetWindowsHookEx
      PID:2420

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

      Filesize

      3KB

      MD5

      020d1cbef5aeb22088c0faff8d76af4e

      SHA1

      93e7f27b8fb57cfea4ae330bedcace1a8ce7c014

      SHA256

      cb283829df7f7ca2f7f8072ed014bebb7d424581e8672a9fa5683f3674726bb0

      SHA512

      1046228ed9d08e5296c02409b5aa460e8280a633f7f2022ec7dc7c1e750522260006844bd5114ec713593bce1d10b8932963a8630e6707e76b45a0cb8c8ff53d

    • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

      Filesize

      1KB

      MD5

      714c05aecb94594ffcbd61b1eea79d83

      SHA1

      966442eb5cbf00d3d94dff78b67df228e49e1b9f

      SHA256

      07c4ee5409cd3d2f979809ec3eb3b7f245dd5c32d733fa8c683984ba5dfe4c4c

      SHA512

      9777034067dc146ec21c91f357a62fb6841744b1b258b1c642173285636a5e13e6ef6e536fb99331caa1de155071f5e7dd3f3d619992e5e78e319db2862c4b9c

    • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

      Filesize

      1KB

      MD5

      9cd385a8407b740d8ccf942e1b749796

      SHA1

      1c82a815db368dca24d0895c8b72119defd4db6e

      SHA256

      e240b9a6d234d1033f92f70cca9a20d0262b6ca4fb0cfab707cccf6a6c9b9dde

      SHA512

      bf470a6f7d4e165f0aea594064b99ab6ab59c10c89b687ea64a8d819e1fa2e73d7d6ce23759b0b9dc98416749d40dd1f897796aec235e6e868ede38de4da59cc

    • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

      Filesize

      1KB

      MD5

      73fd21e21176268bda8300180d019196

      SHA1

      cca444133c29a9540ace354c5ea18cb25d28c20b

      SHA256

      613c036439748efdeb68321da78143aa167565b82595a7add9aa1bdef864bf82

      SHA512

      2fac71079e6bd5f0a11b6d8b84e9af94f876689ecb37218903420f7b4cd31af2fbddeecfd2bd72849b77dacd7130d37f4f53bc778c05452b9bb5c1c3f415ed6a

    • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_a0ckztk4.f0y.ps1

      Filesize

      60B

      MD5

      d17fe0a3f47be24a6453e9ef58c94641

      SHA1

      6ab83620379fc69f80c0242105ddffd7d98d5d9d

      SHA256

      96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

      SHA512

      5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

    • C:\Users\Admin\AppData\Local\Temp\tmp4987.tmp.bat

      Filesize

      166B

      MD5

      b05380e3ed78db2bc1d704f2ebdb086f

      SHA1

      db1a9e10d330d998dc767d79666d6d251f59d3a3

      SHA256

      3f80a97fbd208ac03f598ca9b3dd9fb36efa02c5f483376932630ba776c3821c

      SHA512

      b8794f72fb82dbb12a39680171b6344883421e5ef9cad867c2ee70fbc5d147cff1b92149444455a40ee0f347128a91adf85da7025acbf6d7e73d13d2a9907d1f

    • C:\Users\Admin\AppData\Local\Temp\update.exe

      Filesize

      41KB

      MD5

      3d8c8bdb3f9f8e2176e28bef2c32a872

      SHA1

      c94ee52f063a8bcb37878a4a35f01e649a82d452

      SHA256

      56abf6e0538aa01c4d703d318d6ab9d9f1d82a56e8327fa051af57c209270721

      SHA512

      8ade0497a2f0d203c564fd90f7a370dc5c4c4bc6b2ec32d33da3d57897f4409b2857883aa3bb6c21276960035d07079422aaaf72987b9cce0e10efad77759138

    • memory/1136-0-0x00007FF9ABA73000-0x00007FF9ABA75000-memory.dmp

      Filesize

      8KB

    • memory/1136-69-0x00007FF9ABA70000-0x00007FF9AC532000-memory.dmp

      Filesize

      10.8MB

    • memory/1136-76-0x00007FF9ABA70000-0x00007FF9AC532000-memory.dmp

      Filesize

      10.8MB

    • memory/1136-42-0x00007FF9ABA73000-0x00007FF9ABA75000-memory.dmp

      Filesize

      8KB

    • memory/1136-2-0x00007FF9ABA70000-0x00007FF9AC532000-memory.dmp

      Filesize

      10.8MB

    • memory/1136-1-0x0000000000600000-0x0000000000610000-memory.dmp

      Filesize

      64KB

    • memory/1976-15-0x00007FF9ABA70000-0x00007FF9AC532000-memory.dmp

      Filesize

      10.8MB

    • memory/1976-19-0x00007FF9ABA70000-0x00007FF9AC532000-memory.dmp

      Filesize

      10.8MB

    • memory/1976-12-0x00007FF9ABA70000-0x00007FF9AC532000-memory.dmp

      Filesize

      10.8MB

    • memory/1976-13-0x00000161FC210000-0x00000161FC232000-memory.dmp

      Filesize

      136KB

    • memory/1976-14-0x00007FF9ABA70000-0x00007FF9AC532000-memory.dmp

      Filesize

      10.8MB

    • memory/1976-16-0x00007FF9ABA70000-0x00007FF9AC532000-memory.dmp

      Filesize

      10.8MB

    • memory/2236-65-0x000001BF9FDD0000-0x000001BF9FDD1000-memory.dmp

      Filesize

      4KB

    • memory/2236-66-0x000001BF9FDD0000-0x000001BF9FDD1000-memory.dmp

      Filesize

      4KB

    • memory/2236-64-0x000001BF9FDD0000-0x000001BF9FDD1000-memory.dmp

      Filesize

      4KB

    • memory/2236-63-0x000001BF9FDD0000-0x000001BF9FDD1000-memory.dmp

      Filesize

      4KB

    • memory/2236-62-0x000001BF9FDD0000-0x000001BF9FDD1000-memory.dmp

      Filesize

      4KB

    • memory/2236-61-0x000001BF9FDD0000-0x000001BF9FDD1000-memory.dmp

      Filesize

      4KB

    • memory/2236-67-0x000001BF9FDD0000-0x000001BF9FDD1000-memory.dmp

      Filesize

      4KB

    • memory/2236-55-0x000001BF9FDD0000-0x000001BF9FDD1000-memory.dmp

      Filesize

      4KB

    • memory/2236-56-0x000001BF9FDD0000-0x000001BF9FDD1000-memory.dmp

      Filesize

      4KB

    • memory/2236-57-0x000001BF9FDD0000-0x000001BF9FDD1000-memory.dmp

      Filesize

      4KB